Tribe TOTIPALMI.' Ch,—Bill long, rather broad at the base ; tip hooked and acute, the edges not serrated. Nostrils either wanting or hardlyperceptible. Wings rather long ; tarsi short and stout. Toes long and all joined together by broad webs. Face and throatgenerally naked, the latter capable of being more or less extended in the form of a membranous sac or pouch. Four families, the diagnostic characters of which are given below, are comprised in thisstrongly marked tribe, all well represented in North America. The arrangement of thesefamilies, and of their sub-divisions as here adopted, is a little different from that of Bonaparte,given on page 818. 1. Pelecanidae.—Head crested ; bill long, much depressed; tip hooked and acute; nostrilsscarcely perceptible ; sub-maxillary pouch capable of very great extension; tail short androunded. 2. SuLiDAE.—Head without crest; hill moderate in length, stout, straight, compressed on thesides, decurved at point, hut not hooked ; nostrils indistinct; gular sac very small; tail ratherlong and wedge-shaped. 3. Tachypetidae.—Head crested ; bill long, rather slender, strong, much curved at the point,and very acute; nostrils quite small; gular sac rather extensive; tail very long and deeplyforked ; tarsi partly feathered. 4. Phalacrocoracidae.—Head generally with crests; bill moderate, rather slender, unguismuch curved ; nostrils in the adult obliterated ; gular sac moderate ; tail graduated, of moderatelength, with the shafts very strong. ' Prepared by Mr. George N, Lawrenoe, of New York,